package com.cx.zhshopping.utils.image;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;

import androidx.annotation.NonNull;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.Transformation;
import com.bumptech.glide.load.engine.Resource;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapResource;
import com.bumptech.glide.util.Util;

import java.security.MessageDigest;

public class CornerTransform implements Transformation<Bitmap> {

	private BitmapPool mBitmapPool;

	private float radius;

	private boolean exceptLeftTop, exceptRightTop, exceptLeftBottom, exceptRightBotoom;

	/**
	 * 设置不需要圆角的位置
	 */
	public void setExceptCorner(boolean leftTop, boolean rightTop, boolean leftBottom, boolean rightBottom) {
		this.exceptLeftTop = leftTop;
		this.exceptRightTop = rightTop;
		this.exceptLeftBottom = leftBottom;
		this.exceptRightBotoom = rightBottom;
	}

	public CornerTransform(Context context, float radius) {
		this.mBitmapPool = Glide.get(context).getBitmapPool();
		this.radius = radius;
	}


	@Override
	public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {

	}

	public int hashCode() {
		//避免Transformation重复设置,导致图片闪烁,同一个圆角值的Transformation视为同一个对象
		return Util.hashCode(this.getClass().getName().hashCode(), Util.hashCode(this.radius));
	}

	@NonNull
	@Override
	public Resource<Bitmap> transform(@NonNull Context context, @NonNull Resource<Bitmap> resource, int outWidth, int outHeight) {
		Bitmap source = resource.get();
		int finalWidth, finalHeight;
		float ratio; //输出目标的宽高或高宽比例
		if (outWidth > outHeight) { //输出宽度>输出高度,求高宽比
			ratio = (float) outHeight / (float) outWidth;
			finalWidth = source.getWidth();
			finalHeight = (int) ((float) source.getWidth() * ratio); //固定原图宽度,求最终高度
			if (finalHeight > source.getHeight()) { //求出的最终高度>原图高度,求宽高比
				ratio = (float) outWidth / (float) outHeight;
				finalHeight = source.getHeight();
				finalWidth = (int) ((float) source.getHeight() * ratio);//固定原图高度,求最终宽度
			}
		} else if (outWidth < outHeight) { //输出宽度 < 输出高度,求宽高比
			ratio = (float) outWidth / (float) outHeight;
			finalHeight = source.getHeight();
			finalWidth = (int) ((float) source.getHeight() * ratio);//固定原图高度,求最终宽度
			if (finalWidth > source.getWidth()) { //求出的最终宽度 > 原图宽度,求高宽比
				ratio = (float) outHeight / (float) outWidth;
				finalWidth = source.getWidth();
				finalHeight = (int) ((float) source.getWidth() * ratio);
			}
		} else { //输出宽度=输出高度
			finalHeight = source.getHeight();
			finalWidth = finalHeight;
		}

		//修正圆角
		this.radius *= (float) finalHeight / (float) outHeight;
		Bitmap outBitmap = this.mBitmapPool.get(finalWidth, finalHeight, Bitmap.Config.ARGB_8888);
		if (outBitmap == null) {
			outBitmap = Bitmap.createBitmap(finalWidth, finalHeight, Bitmap.Config.ARGB_8888);
		}

		Canvas canvas = new Canvas(outBitmap);
		Paint paint = new Paint();
		//关联画笔绘制的原图bitmap
		BitmapShader shader = new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
		//计算中心位置,进行偏移
		int width = (source.getWidth() - finalWidth) / 2;
		int height = (source.getHeight() - finalHeight) / 2;
		if (width != 0 || height != 0) {
			Matrix matrix = new Matrix();
			matrix.setTranslate((float) (-width), (float) (-height));
			shader.setLocalMatrix(matrix);
		}

		paint.setShader(shader);
		paint.setAntiAlias(true);
		RectF rectF = new RectF(0.0F, 0.0F, (float) canvas.getWidth(), (float) canvas.getHeight());
		canvas.drawRoundRect(rectF, this.radius, this.radius, paint); //先绘制圆角矩形

		if (exceptLeftTop) { //左上角不为圆角
			canvas.drawRect(0, 0, radius, radius, paint);
		}
		if (exceptRightTop) {//右上角不为圆角
			canvas.drawRect(canvas.getWidth() - radius, 0, canvas.getWidth(), radius, paint);
		}

		if (exceptLeftBottom) {//左下角不为圆角
			canvas.drawRect(0, canvas.getHeight() - radius, radius, canvas.getHeight(), paint);
		}

		if (exceptRightBotoom) {//右下角不为圆角
			canvas.drawRect(canvas.getWidth() - radius, canvas.getHeight() - radius, canvas.getWidth(), canvas.getHeight(), paint);
		}

		return BitmapResource.obtain(outBitmap, this.mBitmapPool);
	}
}
